diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PDESC_ZERO.badlib.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PDESC_ZERO.badlib.exe
index e360d25b465b..4985133fb2a6 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PDESC_ZERO.badlib.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PDESC_ZERO.badlib.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 sleep 1000000
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_FUNC.badfunc.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_FUNC.badfunc.exe
index e360d25b465b..4985133fb2a6 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_FUNC.badfunc.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_FUNC.badfunc.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 sleep 1000000
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_LIB.libdash.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_LIB.libdash.exe
index e360d25b465b..4985133fb2a6 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_LIB.libdash.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_LIB.libdash.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 sleep 1000000
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.alldash.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.alldash.exe
index e360d25b465b..4985133fb2a6 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.alldash.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.alldash.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 sleep 1000000
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.badname.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.badname.exe
index e360d25b465b..4985133fb2a6 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.badname.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.badname.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 sleep 1000000
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.globdash.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.globdash.exe
index e360d25b465b..4985133fb2a6 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.globdash.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_NAME.globdash.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 sleep 1000000
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_OFF.toobig.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_OFF.toobig.exe
index e360d25b465b..4985133fb2a6 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_OFF.toobig.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/err.D_PROC_OFF.toobig.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 sleep 1000000
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.coverage.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.coverage.exe
index ddd0f60f63ce..b9365eaafe3d 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.coverage.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.coverage.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 while true; do env > /dev/null; done
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.emptystack.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.emptystack.exe
index 6369bc561412..9b9e2659786d 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.emptystack.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/pid/tst.emptystack.exe
@@ -1,29 +1,29 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 # Use is subject to license terms.
 #
 #ident	"%Z%%M%	%I%	%E% SMI"
 
 exec find / > /dev/null 2>&1
diff --git a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.exe b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.exe
index 5acce76efc6c..d15d0668cfc1 100644
--- a/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.exe
+++ b/cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/speculation/tst.NoSpecBuffer.exe
@@ -1,30 +1,30 @@
-#!/usr/bin/env ksh
+#!/usr/local/bin/ksh -p
 #
 # CDDL HEADER START
 #
 # The contents of this file are subject to the terms of the
 # Common Development and Distribution License (the "License").
 # You may not use this file except in compliance with the License.
 #
 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 # or http://www.opensolaris.org/os/licensing.
 # See the License for the specific language governing permissions
 # and limitations under the License.
 #
 # When distributing Covered Code, include this CDDL HEADER in each
 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 # If applicable, add the following below this CDDL HEADER, with the
 # fields enclosed by brackets "[]" replaced with your own identifying
 # information: Portions Copyright [yyyy] [name of copyright owner]
 #
 # CDDL HEADER END
 #
 
 #
 # Copyright 2017 Li-Wen Hsu <lwhsu@FreeBSD.org>
 
 while true
 do
 	sleep 0.1
 	cat /COPYRIGHT > /dev/null
 done
diff --git a/cddl/usr.sbin/dtrace/tests/tools/dtest.sh b/cddl/usr.sbin/dtrace/tests/tools/dtest.sh
index e87562d2fe45..83f7a6c875da 100755
--- a/cddl/usr.sbin/dtrace/tests/tools/dtest.sh
+++ b/cddl/usr.sbin/dtrace/tests/tools/dtest.sh
@@ -1,135 +1,135 @@
 #!/bin/sh
 
 usage()
 {
     cat >&2 <<__EOF__
 A harness for test cases in the DTrace test suite.
 
 usage: $(basename $0) <testfile>
 __EOF__
     exit 1
 }
 
 gettag()
 {
     local tag
 
     tag=$(basename $1)
     tag=${tag#*.}
     tag=${tag%%[a-z.]*}
     echo $tag
 }
 
 runtest()
 {
     local dflags exe exstatus pid retval status
 
     exstatus=0
     retval=0
 
     case $TFILE in
     drp.DTRACEDROP_*.d|err.*.d|tst.*.d)
         case $TFILE in
         drp.DTRACEDROP_*.d)
             dflags="-x droptags"
             tag=$(gettag "$TFILE")
             ;;
         err.D_*.d)
             exstatus=1
             dflags="-x errtags"
             tag=$(gettag "$TFILE")
             ;;
         err.*.d)
             exstatus=1
             ;;
         esac
 
         exe=${TFILE%.*}.exe
         if [ -f "$exe" -a -x "$exe" ]; then
             ./$exe &
             pid=$!
             dflags="$dflags ${pid}"
         fi
 
         dtrace -C -s "${TFILE}" $dflags >$STDOUT 2>$STDERR
         status=$?
 
         if [ $status -ne $exstatus ]; then
             ERRMSG="dtrace exited with status ${status}, expected ${exstatus}"
             retval=1
         elif [ -n "${tag}" ] && ! grep -Fq " [${tag}] " ${STDERR}; then
             ERRMSG="dtrace's error output did not contain expected tag ${tag}"
             retval=1
         fi
 
         if [ -n "$pid" ]; then
             kill -0 $pid >/dev/null 2>&1 && kill -9 $pid >/dev/null 2>&1
             wait
         fi
         ;;
     err.*.ksh|tst.*.ksh)
         expr "$TFILE" : 'err.*' >/dev/null && exstatus=1
 
-        tst=$TFILE ksh "$TFILE" /usr/sbin/dtrace >$STDOUT 2>$STDERR
+        tst=$TFILE ksh -p "$TFILE" /usr/sbin/dtrace >$STDOUT 2>$STDERR
         status=$?
 
         if [ $status -ne $exstatus ]; then
             ERRMSG="script exited with status ${status}, expected ${exstatus}"
             retval=1
         fi
         ;;
     *)
         ERRMSG="unexpected test file name $TFILE"
         retval=1
         ;;
     esac
 
     if [ $retval -eq 0 ] && \
         head -n 1 $STDOUT | grep -q -E '^#!/.*ksh$'; then
-        ksh $STDOUT
+        ksh -p $STDOUT
         retval=$?
     fi
 
     return $retval
 }
 
 [ $# -eq 1 ] || usage
 
 readonly STDERR=$(mktemp)
 readonly STDOUT=$(mktemp)
 readonly TFILE=$(basename $1)
 readonly EXOUT=${TFILE}.out
 
 kldstat -q -m dtrace_test || kldload dtrace_test
 cd $(dirname $1)
 runtest
 RESULT=$?
 
 if [ $RESULT -eq 0 -a -f $EXOUT -a -r $EXOUT ] && \
    ! cmp $STDOUT $EXOUT >/dev/null 2>&1; then
     ERRMSG="test output mismatch"
     RESULT=1
 fi
 
 if [ $RESULT -ne 0 ]; then
     echo "test $TFILE failed: $ERRMSG" >&2
     if [ $(stat -f '%z' $STDOUT) -gt 0 ]; then
         cat >&2 <<__EOF__
 test stdout:
 --
 $(cat $STDOUT)
 --
 __EOF__
     fi
     if [ $(stat -f '%z' $STDERR) -gt 0 ]; then
         cat >&2 <<__EOF__
 test stderr:
 --
 $(cat $STDERR)
 --
 __EOF__
     fi
 fi
 
 rm -f $STDERR $STDOUT
 exit $RESULT